发明授权
- 专利标题: Signal converter
- 专利标题(中): 信号转换器
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申请号: US287824申请日: 1981-07-28
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公开(公告)号: US4388612A公开(公告)日: 1983-06-14
- 发明人: Katsuaki Takagi , Yuzo Kita
- 申请人: Katsuaki Takagi , Yuzo Kita
- 申请人地址: JPX Tokyo
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX55-102531 19800728
- 主分类号: H03M1/66
- IPC分类号: H03M1/66 ; H03M1/00 ; H03M1/38 ; H03K13/02
摘要:
An analog-to-digital converter includes a capacitor array circuit for determining m upper bits of a digital output, which includes a plurality of capacitors having binary-weighted capacitance ratios and a plurality of switches and which is connected to an input terminal of a sampled analog voltage and a reference voltage source. A resistor string circuit is provided for determining n lower bits of the digital output, including a plurality of switches and which is connected to the capacitor array circuit. A voltage comparator compares an output voltage of the capacitor array circuit with the ground potential and successive approximation registers successively provide pulses for controlling the switches of the capacitor array circuit and the resistor string circuit in accordance with the output of the voltage comparator. A circuit generates timing pulses for controlling the operation of the successive approximation registers. The resistor string circuit applies voltages equal to i/2.sup.n (where i denotes a value expressed by the n lower bits of the digital output) and (2.sup.n -i)/2.sup.n of a reference voltage to the capacitor array circuit, and the capacitor array circuit operates so as to put the input analog signal into a digital signal in accordance with a linear input/output conversion characteristic.
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